<%@ page language="java" pageEncoding="utf-8" %>
<!DOCTYPE html>
<html>
<head>
    <title>原生WebSocket的Jetty实现</title>
</head>
<body>
<h2>Hello World!</h2>
<input id="text" type="text"/>
<button onclick="send()">发送消息</button>
<hr>
<button onclick="closeWebSocket()">关闭WebSocket连接</button>
<hr>
<div id="message"></div>
</body>


<script type="text/javascript">

    var websocket = null;
    //判断当前浏览器是否支持WebSocket
    if ('WebSocket' in window) {

        //conn server
        websocket = new WebSocket("ws://localhost:9999/originalWs");
        alert('你好');
    } else {
        alert('当前浏览器 Not support webSocket');
    }

    //连接发生错误的回调方法
    websocket.onerror = function(){
        setMessageInnerHTML("WebSocket连接发生错误");
    }

    //连接成功建立的回调方法
    websocket.onopen = function(){
        setMessageInnerHTML("WebSocket连接成功");
    }

    websocket.onmessage = function(event){
        setMessageInnerHTML(event.data);
    }

    //监听窗口关闭时间，当窗口关闭的时候，主动关闭websocket连接，防止连接还没发送
    window.onbeforeunload = function(){
        closeWebSocket();
    }

    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML) {
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //关闭WebSocket连接
    function closeWebSocket(){
        websocket.close();
    }

    //发送消息
    function send() {
        var message = document.getElementById('text').value;
        websocket.send(message);
    }

</script>

</html>
